Created
August 25, 2017 15:23
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Creating an async version of forEach on Array.prototype
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| // extend the Array prototype with an asyncForEach method | |
| Array.prototype.asyncForEach = async function (fn) { | |
| for (let i = 0; i < this.length; i++) { | |
| await fn(this[i], i); | |
| } | |
| }; | |
| const arr = ['a', 'b', 'c', 'd']; | |
| // define a Promise wrapper around the setTimeout function | |
| function wait (fn, time) { | |
| return new Promise(resolve => setTimeout(() => {fn();resolve();}, time)); | |
| } | |
| // call an asynchronous function upon each element in the array | |
| arr.asyncForEach(async (item, index) => { | |
| await wait(() => console.log(item), 500); | |
| }); |
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